It's called reality
You obviously don't understand the issue I'm referring to.
A physical book has a presence. It can only be in one place at a time. I know I'm buying a book because I walk out of the shop with it. I know when I'm giving a book to someone because I physically hand it to them. That behaviour needs to be modeled in the digital realm.
That means encapsulating possession as some kind of digitally signed transferable token that represents the item. In the real world the book is the token and the token is the book. In the digital world, the two would be separate. The token would be the key that opens the content. The content could have multiple copies but only one key. The token can be transferred to irrevocably receive / send to establish ownership.
That implies DRM. Your problem is you see DRM the way it's implemented now, where a central authority (who is usually the publisher / store) grants you extremely limited rights to ownership. You don't even own the book, you own a license which can be revoked. You can't transfer your book, or sell it, or lend it or anything else.
DRM does not have to be like that at all. To think of it another way, DRM the way I'm proposing protects YOUR property and YOUR rights, not the publisher's.
DRM could be enforced by a neutral broker that allows licences to be transferred from one person to another. The broker might have to enforce some reasonable rules to address legit concerns such as unfettered lending (e.g. a pool of a million Harry Potter loaners would mean nobody would ever buy the book again) and might have to make the distinction between charities, stores, libraries, publishers, schools, and end users, each with their own lending / resale rules. But it could be liberal and it could model how things work in the physical world.
I mention Bitcoin because although the problem is not quite the same (or as complex) it represents a distributed brokerage for money. Every node participates. To pass money from one person to another just involves pasting their address and an amount into a dialog and then the money is transferred, the P2P network constructs the signed transfer and off it goes. In this case money is the asset being transferred, but it could equally be a token representing a possession.